Miraculous silver-work in stone
Against the blue miraculous skies,
The belfry towers and turrets rise
Out of the arches that enthrone
That airy wonder of the skies.

Softly against the burning sun
The great cathedral spreads its wings;
High up, the lyric belfry sings.
Behold Ascension Day begun
Under the shadow of those wings!

Arthur Symons

http://www.poemhunter.com/poem/at-burgos/